The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2007
Filed:
Jul. 06, 2005
Applicant:
Ayami Imamura, Hachioji, JP;
Inventor:
Ayami Imamura, Hachioji, JP;
Assignee:
Olympus Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a zoom optical system that can offer an effective tradeoff between size reductions and cost reductions and electronic equipment incorporating it. The zoom optical system comprises, in order from its object side, a first lens group Ghaving negative refracting power, a second lens group Ghaving positive refracting power, a third lens group Ghaving negative refracting power and a fourth lens group Ghaving positive refracting power. The second lens group Gconsists of one positive lens. The positive lens satisfies a condition regarding the temperature coefficient of refractive index.